*-*-*-*-*-*-*F3 constructor using a pointer to an interpreted function*-*-*
*-* =========================================================
*-*
*-* npar is the number of free parameters used by the function
*-*
*-* Creates a function of type C between xmin and xmax and ymin,ymax.
*-* The function is defined with npar parameters
*-* fcn must be a function of type:
*-* Double_t fcn(Double_t *x, Double_t *params)
*-*
*-* This constructor is called for functions of type C by CINT.
*-*
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

*-*-*-*-*-*-*-*-*-*-*Compute distance from point px,py to a function*-*-*-*-*
*-* ===============================================
*-* Compute the closest distance of approach from point px,py to this function.
*-* The distance is computed in pixels units.
*-*
*-* Algorithm:
*-*
*-*
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

*-*-*-*-*-*-*-*-*-*-*Execute action corresponding to one event*-*-*-*
*-* =========================================
*-* This member function is called when a F3 is clicked with the locator
*-*
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

*-*-*-*-*-*Return 3 random numbers following this function shape*-*-*-*-*-*
*-* =====================================================
*-*
*-* The distribution contained in this TF3 function is integrated
*-* over the cell contents.
*-* It is normalized to 1.
*-* Getting the three random numbers implies:
*-* - Generating a random number between 0 and 1 (say r1)
*-* - Look in which cell in the normalized integral r1 corresponds to
*-* - make a linear interpolation in the returned cell
*-*

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